.nav {
    height: 58px;
    background-color: #191D3A;
}
.banner {
    height: 460px;
    background-color: green;
}
.content {
    height: 700px;
    background-color: #FFFFFF;
}
.footer{
    height: 191.77px;
    background-color: #191D3A;
}